Since this question often comes up again and again:
Yes, there is a way to find out whether the the SWU is correctly applied and coded. However, one needs to understand that it is not only looking on the "my trips" page, see the two indicators "O" and "confirmed" because they mean nothing as such. Scroll down on the page, locate your ticket number, click on it and a new window appears with more "technical information" about your trip.
If you see something looking the screenshot below, your SWU
IS NOT properly coded (despite showing class "O" and "confirmed" on the trip summary). Remember, it is a trap because they even let you select BE seats at this point, although your ticket is actually still ECONOMY!
If you see something in the lines of below, your SWU
IS properly coded:
Let me repeat just for the sake of completeness: What you see on the trip summary page is irrelevant and merely informative. Even though you see a BE seat, fare class "O", and the magic word "confirmed" next to your segments does not mean that your SWU is properly coded and applied and they may put you in Economy because this is what your ticket (as issued) is saying.
Only the info on your ticket receipt shows what's really going on.
BTW:
Coupon Status "O-AF" does
NOT mean fare class "O" on Air France but that the segment is operated by Air France and that its still Open (not checked-in, flown, or otherwise). Some people seem to mistake the coupon as confirmation that the SWU is in order (well the wording is slightly misleading as the SWU basically is a coupon of some kind).